Abrading brush



IN V EN TOR, gul/'s BY l@ www jdo/17% c. E. sruRGls June 3, 1952 ABRADING BRUSH Filed Aug- 28: 1948 Patented June 3, 1952 UNITED .STATES APATENT OFFICE ABRADING BRUSH Charles E. Sturgis, Rochester, N. Y.

Application August Z8, 1948, Serial N o. 46,581

10 Claims. 1

This invention relates to an abrading brush.

In applioants prior Patent 1,903,520, granted April l1, 1933, there is disclosed an abrading brush having tufts or brushing elements in the form of metal coils made from piano wire or the like.

This invention has for its purpose the production of an abrading brush of the mentioned type wherein the present improved novel construction insures a more rigid unit which affords increased utility, greater reliability in service and longer life.

The various features and advantages will appear from the detailed description and claims when taken with the drawings, in which:

Fig. l is a side elevation, partially in section of the brush of the present invention;

Fig. 2 is a plan View of the head of the brush with the several tufts omitted;

Fig. 3 is a side view partially'in section of one of the tufts; and

Fig. 4 is a cross section taken on the line 4 4 ci Fig. 3, showing especially the intermeshing of the several elements forming a tuft.

The brush of the present invention comprises a stem 5 and a head H supported thereby. The head includes a plurality of tufts 6 each formed of a cluster of helical coils 6a of piano wire or the like. The several coils of each group are of substantially uniform length and are anchored at one end in a circular metal cap 1. This anchoring of coils in the cap can preferably be effected by mechanism disclosed in applicants mentioned prior patent. The cap l, which is initially drawn with straight sides, is formed by the mentioned mechanism to flare inwardly at 8 to a rim 9. This rim grips each individual coil tightly because it conforms to contour of the anchored coils so snugly that the rim portion 9 is corrugated (Fig. 4) The closed end of the cap is initially drawn with an inwardly directed boss I I which is deepened during the mentioned forming operation by a punch (not shown) added to the mentioned mechanism (likewise not shown), to force the turns of adjacent coils to permanently intermesh with one another (Fig. 3) while the rim 9 is being tightly formed around the several coils of a group. This construction insures that the individual coils will be securely anchored in their respective caps and will remain in this condition during long periods of severe use. During the assembling operation of a group of coils and their cap, that is, while the cap is being formed as just mentioned, the base of the cap is shaped to have a thickened annular bottom rib I2. This rib takes the wear occasioned bythe rotation of the several caps on the inner bottom surface of the head. It will be noted, especially in Fig. 3, that the coils flare outwardly from the cap to enable the brush to reach nooks and corners in the work to be cleaned.

The tufts of coils 5 together with their retaining caps 1, are mounted in a metal cup I4 comprising the head H. The cup I4 has a` centrally perforated fiat bottom against the inner surface of which the ribs I2 on the several caps can bear. The stem 5 is anchored centrally of the bottom of the cap in ush relation with the inner surface thereof. Preferably the stem is made with an enlargement I6 at one end portion thereof. Beyond the enlargement, the mentioned end portion of the stem is reduced to the diameter of the opening in the bottom of the cup, thereby providing an annular shoulder II on the stem. The shoulder engages the margin of the cup at the central opening therein and the adjacent end of stem is riveted at I8 over the mentioned margin of the cup. This margin is preferably depressed so that the riveted end of the stem will be fiush with-the inner surface of the bottom of the cup.

The individual tufts or groups are retained in the cup by a locking plate 20 herein provided with three openings in which three tufts G, as illustrated, are freely movable. The rim 2l of the cup is spun over the edge of the locking plate 20 to fasten it securely in the cup. Each opening in the plate is surrounded by an integral, downwardly-flaring ange 22 which generally conforms to the side contour of the cap 1. While each cap and its tufts can rotate freely and can rock slightly in its flange 22 the cap I is too large to pass therethrough.

It will be noted that the margin of the locking plate 20 between each opening therein is provided with a boss 23. These bosses prevent the locking plate 20 from being distorted during its fabrication and also reinforce the plate during use. These bosses project beyond the spun-over rim 2| and take the wear which Would otherwise grind off this rim thereby releasing the locking plate and rendering the brush useless.

What I claim is:

1. In an abrading brush, a cup having an integral side and bottom, a plurality of tufts of coiled abrading elements each having one end portion mounted in said cup for limited rocking movement therein, and a flat, circular, locking plate engaging the mounted end portion of each of said tufts and having apertures therein through which said tufts project for retaining them in said cup, the edge of said cup being formed over the edge of said plate to secure the plate to said cup.

2. In an abrading brush, a cup having an integral side and bottom, a plurality of tufts of coiled abrading elements mounted in said cup for limited rocking movement therein, a locking plate engaging an end portion of each of'said tufts and having apertures therein through which said tufts project for retaining them i said cup, the edge of said cup being formed over the edge of said plate to secure the plate to said cup, and bosses projecting outward fromthe margin of said plate between said tufts whereby the (formed edge of said cup is protected from wear. Y

3. In an abrading brush, a cup having an integral side and bottom, a plurality of tufts of coiled abrading elements mounted in the cup, each` tuft comprising a cap in which several abrading elements are secured, the cap ends of said,tufts being enclosed in said cup, and a locking plate closing said cup and having apertures therein through which said tuits loosely project for limited rocking movement on said bottom, said apertures Ybeing of such size that a cap will not pass therethrough, the edge of the cup and the edge of the plate being interlocked.

4. In an abrading brush, a cup having an integral side and bottom, a plurality of coiled tufts of abrading elements mounted in the cup, each tuft comprising a cap in which several abrading elements are secured, the bottom of said cap eing provided with an annular rib, the cap ends of said tufts being enclosed in said cup, a locking plate closing said cup and having a plurality of apertures therein through which said tufts loosev ly project for limited rocking movement of 'said ribs on said bottom, said apertures being of such size that a cap will not pass therethrough, the edge of the cup and the edge of said plate being interlocked, and a bossl projecting outward from the plate'in the space between adjacent apertures near saidedges.

5. In an abrading brush, a stem and at least one tuft mounted thereon, said tuft comprising a group' of elongated abrading elements extending side by side, each element being made in the forni of a coil of Wire, and a cap gripping one end of the group of elements with a turn of each element at the gripped end thereof holding apart adjacent turns of a nearby element and projeoting into the space between said turns.

6. In an abrading brush, a stem and at least one tuft mounted thereon, said tuft comprising a group of elongated abrading elements extending side by side, each element being made in the form of a coil of wire, and a cap gripping one end of the group of elements with turns of each element at the gripped end thereof held apart and intermingling in the resulting spaces between adjacent turns ofnearby elements.

7. In an abrading brush, a stem and at least one tuft mounted thereon, said vtuft comprising a group of elongated abrading elements extending side by side, each element being made in the form of a coil of wire, and a cap gripping one end of the group of elements with several turns of adjacent elements at the gripped-end portions thereof forced apart and intergripping one another in the resulting spaces.

8. In an abrading brush, a stem and at least one tuft mounted thereon, said tuft comprising a group of elongated abrading elements extending side by side, each element being made in the form of a coil of wire, and a cap gripping one end of the group of elements with the turns of the several elements at the gripped end thereofY forced apart and intermeshing with the turns of adjacent elements in the resulting spaces between the forced apart turns.

9. Inv an. abrading brush, a stem at least one tuft mounted thereon, said tuft comprising a one-piece cap having a flat inner bottom surface except for a central inwardly directed integral boss, said cap having a side tapering inwardly to a rim of restricted diameter as compared to' said bottom, and brush elements in the form of a group, of coils extending in a common directionV and having one of the common ends of the group gripped in said cap, said boss and said sideden-ing an annular space for said elementsand causing a turn of each element to force apart turns of an adjacent element and to enter the resulting space therebetween.

10. In an abrading brush, a cup having an integral side and bottom, a plurality of tufts of coiled abrading elements each having one end portion mounted in said cup for limited rocking movement therein, the tuft comprising a group of Velongated abrading elements extending side by side, each element being made in the forni of a coil of wire, and a cap gripping one end of the group of elements with a turn of each element at the gripped end thereof forcing apart adjacent turns of a nearby element and projecting into tl e resulting spaceA therebetween, and a flat circular, locking plate having a plurality of apertures thereon through which said tufts project, said apertures being of such size that the mounted end portion of each of said tufts will not pass therethrough, the edge of said cup being formed over the edge of said plate to secure the plate to said cup.

CHARLES E. S'IURG-IS.

REFERENCES CTED The following references are of record in the iile of this patent:

Fogliasso Jan. 15, 1946 

